1 // 32bit code to Power On Self Test (POST) a machine.
3 // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
4 // Copyright (C) 2002 MandrakeSoft S.A.
6 // This file may be distributed under the terms of the GNU GPLv3 license.
8 #include "ioport.h" // PORT_*
9 #include "config.h" // CONFIG_*
10 #include "cmos.h" // CMOS_*
11 #include "util.h" // memset
12 #include "biosvar.h" // struct bios_data_area_s
13 #include "ata.h" // hard_drive_setup
14 #include "disk.h" // floppy_drive_setup
15 #include "memmap.h" // add_e820
16 #include "pic.h" // pic_setup
17 #include "pci.h" // create_pirtable
18 #include "acpi.h" // acpi_bios_init
19 #include "bregs.h" // struct bregs
21 #define bda ((struct bios_data_area_s *)MAKE_FARPTR(SEG_BDA, 0))
22 #define ebda ((struct extended_bios_data_area_s *)MAKE_FARPTR(SEG_EBDA, 0))
25 set_irq(int vector, void *loc)
27 SET_BDA(ivecs[vector].seg, SEG_BIOS);
28 SET_BDA(ivecs[vector].offset, (u32)loc - BUILD_BIOS_ADDR);
31 // Symbols defined in romlayout.S
32 extern void dummy_iret_handler();
33 extern void entry_08();
34 extern void entry_09();
35 extern void entry_hwirq();
36 extern void entry_0e();
37 extern void entry_10();
38 extern void entry_11();
39 extern void entry_12();
40 extern void entry_13();
41 extern void entry_14();
42 extern void entry_15();
43 extern void entry_16();
44 extern void entry_17();
45 extern void entry_18();
46 extern void entry_19();
47 extern void entry_1a();
48 extern void entry_1c();
49 extern void entry_40();
50 extern void entry_70();
51 extern void entry_74();
52 extern void entry_75();
53 extern void entry_76();
58 dprintf(3, "init bda\n");
59 memset(bda, 0, sizeof(*bda));
61 SET_BDA(mem_size_kb, BASE_MEM_IN_K);
65 set_irq(i, &dummy_iret_handler);
67 set_irq(0x08, &entry_08);
68 set_irq(0x09, &entry_09);
69 //set_irq(0x0a, &entry_hwirq);
70 //set_irq(0x0b, &entry_hwirq);
71 //set_irq(0x0c, &entry_hwirq);
72 //set_irq(0x0d, &entry_hwirq);
73 set_irq(0x0e, &entry_0e);
74 //set_irq(0x0f, &entry_hwirq);
75 set_irq(0x10, &entry_10);
76 set_irq(0x11, &entry_11);
77 set_irq(0x12, &entry_12);
78 set_irq(0x13, &entry_13);
79 set_irq(0x14, &entry_14);
80 set_irq(0x15, &entry_15);
81 set_irq(0x16, &entry_16);
82 set_irq(0x17, &entry_17);
83 set_irq(0x18, &entry_18);
84 set_irq(0x19, &entry_19);
85 set_irq(0x1a, &entry_1a);
86 set_irq(0x1c, &entry_1c);
87 set_irq(0x40, &entry_40);
88 set_irq(0x70, &entry_70);
89 //set_irq(0x71, &entry_hwirq);
90 //set_irq(0x72, &entry_hwirq);
91 //set_irq(0x73, &entry_hwirq);
92 set_irq(0x74, &entry_74);
93 set_irq(0x75, &entry_75);
94 set_irq(0x76, &entry_76);
95 //set_irq(0x77, &entry_hwirq);
97 // set vector 0x79 to zero
98 // this is used by 'gardian angel' protection system
99 SET_BDA(ivecs[0x79].seg, 0);
100 SET_BDA(ivecs[0x79].offset, 0);
102 set_irq(0x1E, &diskette_param_table2);
108 memset(ebda, 0, sizeof(*ebda));
109 ebda->size = EBDA_SIZE;
110 SET_BDA(ebda_seg, SEG_EBDA);
111 SET_BDA(ivecs[0x41].seg, SEG_EBDA);
112 SET_BDA(ivecs[0x41].offset
113 , offsetof(struct extended_bios_data_area_s, fdpt[0]));
114 SET_BDA(ivecs[0x46].seg, SEG_EBDA);
115 SET_BDA(ivecs[0x41].offset
116 , offsetof(struct extended_bios_data_area_s, fdpt[1]));
122 dprintf(3, "Find memory size\n");
123 if (CONFIG_COREBOOT) {
126 // On emulators, get memory size from nvram.
127 u32 rs = ((inb_cmos(CMOS_MEM_EXTMEM2_LOW) << 16)
128 | (inb_cmos(CMOS_MEM_EXTMEM2_HIGH) << 24));
130 rs += 16 * 1024 * 1024;
132 rs = (((inb_cmos(CMOS_MEM_EXTMEM_LOW) << 10)
133 | (inb_cmos(CMOS_MEM_EXTMEM_HIGH) << 18))
135 SET_EBDA(ram_size, rs);
136 add_e820(0, rs, E820_RAM);
138 // Check for memory over 4Gig
139 u64 high = ((inb_cmos(CMOS_MEM_HIGHMEM_LOW) << 16)
140 | (inb_cmos(CMOS_MEM_HIGHMEM_MID) << 24)
141 | ((u64)inb_cmos(CMOS_MEM_HIGHMEM_HIGH) << 32));
142 SET_EBDA(ram_size_over4G, high);
143 add_e820(0x100000000ull, high, E820_RAM);
145 /* reserve 256KB BIOS area at the end of 4 GB */
146 add_e820(0xfffc0000, 256*1024, E820_RESERVED);
149 // Don't declare any memory between 0xa0000 and 0x100000
150 add_e820(0xa0000, 0x50000, E820_HOLE);
152 // Mark known areas as reserved.
153 add_e820((u32)MAKE_FARPTR(SEG_EBDA, 0), EBDA_SIZE * 1024, E820_RESERVED);
154 add_e820(BUILD_BIOS_ADDR, BUILD_BIOS_SIZE, E820_RESERVED);
156 dprintf(1, "ram_size=0x%08x\n", GET_EBDA(ram_size));
160 init_bios_tables(void)
163 // XXX - not supported on coreboot yet.
182 dprintf(3, "init boot device ordering\n");
185 struct ipl_entry_s *ip = &ebda->ipl.table[0];
186 ip->type = IPL_TYPE_FLOPPY;
190 ip->type = IPL_TYPE_HARDDISK;
194 if (CONFIG_CDROM_BOOT) {
195 ip->type = IPL_TYPE_CDROM;
199 ebda->ipl.count = ip - ebda->ipl.table;
200 ebda->ipl.sequence = 0xffff;
201 if (CONFIG_COREBOOT) {
202 // XXX - hardcode defaults for coreboot.
203 ebda->ipl.bootorder = 0x00000231;
204 ebda->ipl.checkfloppysig = 1;
206 // On emulators, get boot order from nvram.
207 ebda->ipl.bootorder = (inb_cmos(CMOS_BIOS_BOOTFLAG2)
208 | ((inb_cmos(CMOS_BIOS_BOOTFLAG1) & 0xf0) << 4));
209 if (!(inb_cmos(CMOS_BIOS_BOOTFLAG1) & 1))
210 ebda->ipl.checkfloppysig = 1;
239 floppy_drive_setup();
247 // Clear .bss section for C code.
251 dprintf(3, "clearing .bss section\n");
252 extern char __bss_start[], __bss_end[];
253 memset(__bss_start, 0, __bss_end - __bss_start);
256 // Reset DMA controller
260 // first reset the DMA controllers
261 outb(0, PORT_DMA1_MASTER_CLEAR);
262 outb(0, PORT_DMA2_MASTER_CLEAR);
264 // then initialize the DMA controllers
265 outb(0xc0, PORT_DMA2_MODE_REG);
266 outb(0x00, PORT_DMA2_MASK_REG);
269 // Check if the machine was setup with a special restart vector.
271 check_restart_status()
273 // Get and then clear CMOS shutdown status.
274 u8 status = inb_cmos(CMOS_RESET_CODE);
275 outb_cmos(0, CMOS_RESET_CODE);
277 if (status == 0x00 || status == 0x09 || status >= 0x0d)
281 if (status != 0x05) {
282 BX_PANIC("Unimplemented shutdown status: %02x\n", status);
286 // XXX - this is supposed to jump without changing any memory -
287 // but the stack has been altered by the time the code gets here.
290 memset(&br, 0, sizeof(br));
291 br.cs = GET_BDA(jump_cs_ip) >> 16;
292 br.ip = GET_BDA(jump_cs_ip);
296 // 32-bit entry point.
301 check_restart_status();
303 debug_serial_setup();
304 dprintf(1, "Start bios\n");
306 // Setup for .bss and .data sections
307 make_bios_writable();
310 // Perform main setup code.
313 // Present the user with a bootup menu.
314 interactive_bootmenu();
316 // Setup bios checksum.
317 extern char bios_checksum;
318 bios_checksum = -checksum((u8*)BUILD_BIOS_ADDR, BUILD_BIOS_SIZE - 1);
320 // Prep for boot process.
321 make_bios_readonly();
323 // Invoke int 19 to start boot process.
324 dprintf(3, "Jump to int19\n");
326 memset(&br, 0, sizeof(br));
327 call16_int(0x19, &br);
330 // Ughh - some older gcc compilers have a bug which causes VISIBLE32
331 // functions to not be exported as a global variable - force _start
332 // to be global here.
333 asm(".global _start");